Tube-splicing



M. A. MARQUETTE.

TUBE SPLICING.

APPLICATION FILED NOV-9, 1920. I

Patented July 19, 1921'.

2 SHEETS-'SHEET 1.

iHvENmR' ATTO Meivcn fiMarquew ren used. in automz UNITED STATES PATENT orrics.

MELVON A. MARQUE'ITE, 0F CHICDPEE FALLS, MASSACHUSETTS. ASSIGNOR TO THE FISK RUBBER, COMPANY, OF MASSACHUSETTS.

0F CHICOPEE FALLS,

MASSACHUSETTS, A. CORPORATION Specification of Letters Patent.

Patented July 19, 1921.

Application filed November 9, 1920. Serial No. 422,785.

To all whom it may concern;

Be it known that I, MELVON A. MAR- onnr're, a citizen of the United States of America, residing at Chicopee Falls, in the county of Hampden and State of Massa chusctts, have invented certain new and useful Improvements in 'lube-Splicing, of which the following is a specification.

My invention relates to the splicing of rubber tubes, iarticularly the inner tubes bllG tire casin s.

In the manufacture of inner tubes a straight tube is first formed which then has its ends joined to form the annular tube used in tires. My invention relates to improvcinents in methods and apparatus for performing this splicing operation. and has for its operation the facilitation of the operation itself and the improvement of the splice obtained thereby.

My invention will now be particular reference to the drawings, in which,

Figure 1 is a fragmentary View of one manner of cementing two tube sections to be joined,

Figs. 2 and 3 how splicing operation;

Figs. 4, 5, and 6 show steps in a different method of splicing;

Fig. 7 is a view of a completed'tube;

Fig. 8 is an elevation, partly broken away, of the external mandrel used; and p '2 Fig. 9 is an end view of the mandrel shown in Fig. 8.

' The splicing operation to which my invention relates may be carried out either by the hot or cold method of vulcanization, my invention being directed more particularly to the method of joining the ends of a tube prior to the actual vulcanization. For convenience, however, I will describe the process as applied to the preparation of the splice for cold vulcanization. in joining the ends of a tube I make use an external mandrel such as is shown in As this mandrel will be rethe description of the describe it before turnaccompanying subsequent steps in the Figs. 9 and 9. i'crrcd to through process itself, T will ing to its application in the splicing operation. This mandrel comprises a hollow apdescribed with and connects with the hollow interior 13 of the mandrel by a plurality of small holes connection 15 is provided whereby the chamber 12 may be connected to a. suitable means of producing a partial Vacuum. The mandrel may be supported in any Suitable way, as by a standard 16 to which the mandrel is held by Win nuts 17.

licturning to t e phedto a. cold or acid cure, a suitable vulcanizing cement is way, as by folding end 20 back on itself as at 21, and by then'applyin with a brush a coatof cement 22 to the folded back portion. and a coat 23 to the outside of the other tube end 24. After the cement is dry the end 20 is turned straight again so that the cemented surface This end is then inserted into the external mandrel previously described, chamber 12 being at this time connected to a partial vacuum. The end of the tube is pressed by the hand of the operator or means into contact with the interior of the mandrel, the suction applied through holes 4 serving to hold it distended. The cemcnted portion 23 of tube end 24 is now coated with a suitable vulcanizing acid, unless such acid was incorporated in the coment as originally applie preferably slightly folded as shown in Fig. 2. is inserted within the distended end 20. {v now introducing air pressure within the tube by a suitable connection 25 the tube is caused to expand, bringing the two tolescoped ends into firm contact as shown in Fig. 3. The joint is now left in this condition for a time sufficient for vulcanization to take place. The tube is then deflated and removed from the external mandrel through. opening 11.

Another method of splicing a tube is shown in Figs. 4. 5. End 20 is preand 6. pared and located within the external manany suitable d, and this end,

sp icing process as ap Ioo drel in the same manner as betonc End .1. 4 24, however, is rcvcrscly folded asshown-p,

at 29 in Fig. 4 upon a split mandrel 30 having an opening 31 whereby the tube may be removed after vulcanization, and a coat 32 of cement applied to the outer surface. The tube end 24 so prepared and mounted is in sorted within the distended end 20, and the vacuum in chamber 12 broken, allowing the end 20 to contractupon end 24, as shown in Fig. 6. The joint is now pressed tightly against the mandrel 30 by a elastic tape 35 or other 3115mm the splice allowed time so 0 ingis then removed, and tube ened out and removed through slot It will be understood sixiu the procedure mm be yerting from the l sev' forth in the {1p uended o. 7 ticuler, the manner of vulcenin 1 varied, my invention relating to the physical manner of placing the tube em? in proper lapped relation rather than to toe ehemicai method of vulcanization.

Having thus described my invention, claim:

1. The method of splicing tubes compulsing coating the inner surface of one session of tube and the outer surface 0% 21". i1 o tion of tube with cement holding was section having its inner surface coated. disfi'ended without interfering with its inner surface, locating the second section Within the first section and bringing C6- meu'ted surfaces into contact 2. The method of joining tubes comprising holding one section of 'fiube diseended by means applied to its ouiel' surface, heating a second section of tube Wi .1 in the distended portion of the first, bringir g the adj scent surfaces of the two sections iuto contact. e

3. The method of joining "Lubes comprising holding one section of tube distended by sue- 'tion' applied to its outer sorta Locating a second section oftube Within the distended [portion of thefirsiz, and br'.. she ed521- oeut surfaces of the two sessions into eon-- *act. 4. The method of joining euos o1:

- mm'xpriw u :1 mimof who d 1 opp Ned to In: outer so) he mumh'ci tiou thereon Wiihi mi'endod. pm-Hon oi the swond and 1- 7 i1 ended por- 01 the second so ghum so 12m; ii; may conhe ends of an Jon 00:11pm h ou'o end of the o she first end upon 1: split lilo commuted surface is I I .10 second end distended u when a'pphoo to us outer surface, 10mshe numdl'ol carrying (he first; end Within tended second end, allowing the secand end. io emuu'eei; upon the eemeuted pol tion of the end czu'ried by (he mex'ldrei, press use, a. chamber in said shell J of f s inner 51L oonnef o 'Lmufiious and means wherei 30;: may be connected to SOURCE 

